Add batches API to facade

Author: gehrisandro

src/Facades/OpenAI.php

@@ -12,6 +12,7 @@
 /**
  * @method static \OpenAI\Resources\Assistants assistants()
  * @method static \OpenAI\Resources\Audio audio()
+ * @method static \OpenAI\Resources\Batches batches()
  * @method static \OpenAI\Resources\Chat chat()
  * @method static \OpenAI\Resources\Completions completions()
  * @method static \OpenAI\Resources\Embeddings embeddings()